Determination of geographical domain of Iran deserts
abstract
In order to recognize and mapping domains of the real deserts, it is needed to gather a fermendous data and information regarding environmental parameters such as Geology, Geomorphology, Climatology, Hydrology, Pedology and Vegetation cover. In fact these environmental parameters and their interaction effects lead to form and develop the real deserts. Thus in this research we try to study the most specification of desert to seek these processes based on related sciences. After determination of desert boundaries, the degree of contribution or segregation of each individual desert unit were recognized and mapped digitally using Geographical Information System (GIS).finally based on the executive instruction of this project after recognition of the natural desert units in the country map with utilization of the coordinate system of Iran's map georeferences and control check point all natural desert units were set up on the whole country map.
Individual investigation of deserts due to environmental parameters indicated the climatic deserts and vegetation cover feature have the maximum area respectively (706672&600467 km2), while geologic and geomorphologic deserts have the minimum area respectively (208041 & 287316 km2). Crossing and matching of different layers showed that each individual layers covers different desert area on the map. Thus, if climatic parameters are used to determine desert area only 42.9% of Iran is accounted, while if the geologic parameters are used, 12.6% of Iran is known as a desert. The common parts of overlaying all parameters were selected as a true desert, in this case the whole areas which known as true deserts are 16.9% of Iran map (278513 km2). In this area vital resources are limited seriously by harsh conditions such as evaporate formations, low precipitation, together with high evaporation and temperature.
Key word: Desert, Geology, Geomorphology, Climatology, Hydrology, Pedology, vegetation cover. GIS, Iran.
In order to recognize and mapping domains of the real deserts, it is needed to gather a fermendous data and information regarding environmental parameters such as Geology, Geomorphology, Climatology, Hydrology, Pedology and Vegetation cover. In fact these environmental parameters and their interaction effects lead to form and develop the real deserts. Thus in this research we try to study the most specification of desert to seek these processes based on related sciences. After determination of desert boundaries, the degree of contribution or segregation of each individual desert unit were recognized and mapped digitally using Geographical Information System (GIS).finally based on the executive instruction of this project after recognition of the natural desert units in the country map with utilization of the coordinate system of Iran's map georeferences and control check point all natural desert units were set up on the whole country map.
Individual investigation of deserts due to environmental parameters indicated the climatic deserts and vegetation cover feature have the maximum area respectively (706672&600467 km2), while geologic and geomorphologic deserts have the minimum area respectively (208041 & 287316 km2). Crossing and matching of different layers showed that each individual layers covers different desert area on the map. Thus, if climatic parameters are used to determine desert area only 42.9% of Iran is accounted, while if the geologic parameters are used, 12.6% of Iran is known as a desert. The common parts of overlaying all parameters were selected as a true desert, in this case the whole areas which known as true deserts are 16.9% of Iran map (278513 km2). In this area vital resources are limited seriously by harsh conditions such as evaporate formations, low precipitation, together with high evaporation and temperature.
Key word: Desert, Geology, Geomorphology, Climatology, Hydrology, Pedology, vegetation cover. GIS, Iran.
posted by khosroshahi | 9:55 PM
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